Stay bolt for boilers



Dec. 1924- 1,520,540

. E.'G. FLANNERY ET AL Patented Dec. 23, 1924. 1,520,540

UNITED/STATES PATENT orrnca.

EUGENE G. 'FLANNERY AND GBOVER- R. GREENSLADE. OF PITTSBURGH, PENNSYL- VANIA, ASSIGNOBS '10 FLANNERY BOLT COMPANY, OF PITTSBURGH, PENNSYL- 'VAIN'IA.

g I STAY BOLT FOB BOILERS. Application filed February 1, 1928, Serial No. 816,895. lenewedflctober 14, 19%.

To all whom it may concern: h The staybolt 1 is provided with a telltale 55 Be it known that we, EUGENE G. FLAN- hole 2 which, in the construction shown in NERY and Gnovan R. GREENSLADE, citizens of the drawings, extends from the inner end the United States, and residents of Pittsof the bolt approximately to but not through 5 burgh, in the countyof Allegheny and State 'the outer end there0f,--sa1d telltale hole of Pennsylvania, have invented certain new terminating within the head 3 of the bolt. 60

and useful Improvements in Stay Bolts for The Wall of the telltale hole is insulated Boilers; and we do hereby declare the folagainst contact of moisture therewith so as lowing to be a full, clear, and exact descripto prevent oxidation of the iron wall of the tion of the invention, such as will enable hole and thus to prevent the accumulation others skilled in the art to which it apperof solid particles within the hole, resulting 65 tains to make and use the same. from rust or corrosion. This insulation may This invention relates to improvements lIl consist of a coating 4 on the wall of the staybolts for boilers. telltale hole and such coating may be an Heretofore, it has been customary to conelectro-plating of said wall with metal which struct staybolts for boilers of ferrous metal, wlll not be chemically or otherwise affected 70 such as iron, and to provide the bolts with by mo sture in a manner to produce rust or openings known in the. art as telltale holes corrosion. Such a metal for coating the or bores. In some instances, the telltale wall of the telltale hole in an iron bolt might openings extend partially through the bolt, be copper. Instead of coating the wall of axially thereof, and in other instances, such the hole by a plating, said wall maybe in- 7.5 openings which provide telltale holes extend sulated for the purpose specified, with the from the inner end of the bolt approxiuse of lacquer, paint, varnish or other like mately to but not through the outer end of material.

the bolt where the head is formed. Where The ob'ect of our invention might also be the bolts are provided at their outer ends attain y r Viding the Wall of the tcllwith heads (which is the more prevalent tale hole wit a lining member which may construction), the telltale holes terminate be inserted'into said hole. For example, a ithin s h h ds, Whe the bolts are tube of thin copper or other non-ferrous 30 made of iron (which is the usual practice), metal or material may be 'nserted into the difficulty has been caused from the rusting telltale hole so as to ine or cover the wall as of the wall of the telltale hole, such rusting. of said hole as indicated at- 5 in Figure 2. resulting in the accumulation. of sufiicient I Having fully described our invention solid particles within the telltale hole, to What We claim as new and desire to secure at clog the latter to a greater or less extent by Letters-Patent, is:

and thus impair the accurate functioning of 1. A staybolt for boilers having a telltale the telltale hole to give to the inspector, hole extending from one end of the bolt reliable and unmistakable information as to axially thereof, said hole having its other the exact condition of the bolt. end closed, at least the end wall of said 40 The object of our present invention is to hole at said closed end thereof being rust provide efficient means in a staybolt, which or corrosion proof. will prevent rust or corrosion of the wall 2. A staybolt for boilers having a telltale of the telltale hole and the accumulation of hole extending from onel end of the bolt solid particles incident to such rust or coraxially thereof, said hole having its other 45 rosion. end closed, and means protectin at least the With this object in view, the invention end wall of said hole at sai closed end consists in certain features, in the combinathereof against rust or corrosion.

tion. -of. a staybolt, as hereinafter set forth 3. A ferrous staybolt for boilers, having a or and pointed out in the claims. telltale hole, and a non-ferrous covering 50 In theaccompanying drawings,- the wall of said hole to insulate said wall Figure 1 is a sectional view of a staybolt from contact of any corrosive or rust-form'- exemplifying our invention, and ing substances.

Figure-'2 is a similar view showing another 4. A staybolt having a telltale hole, and way of efi'ecting the ob ect of our invention. means in said hole to prevent rust or corrosion, said means consisting of an insulating covering for the Wall of said telltale hole.

5. A staybolt for boilers, having a'telltale hole, the Wall of said hole having a protective coating.

6. A staybolt for boilers, having a telltale hole, and material contacting with the wall of.said telltale hole to prevent contact of moisture with said wall.

7. A staybolt for boilers, having a telltale hole, the Wallof said hole being plated with a substance other than. that of which the 

